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In the past, records show, the group has received much of its funding from AFSCME, and two teachers unions have given nearly a half-million dollars in recent months, according to the union PACs’ filings.

The AFL-CIO filed a friend-of-the-court brief in the Citizens United case, hoping that an unlimited right to spend its money on ads would bring back labor’s prominence.

But Federal Election Commission filings make clear that, despite unions’ significant efforts on the liberal side, conservatives have had an advantage of well over $100 million in outside money spent. Americans for Prosperity, a Koch-connected group, will spend $100 million alone, and the Chamber of Commerce has spent $29 million on politics.

The AFL-CIO has since had a change of heart, and unions now regularly assail the regulations that have flooded the airwaves with corporate money.

AFL-CIO, AFSCME and SEIU all did not return requests for comment.